I've lost two tail lights this year due to sketchy mounts (and our terrible roads) and retired a third from old age (switch died). I used Niterider lights for commuting for 20 years and this tail light looked like it would work for my day rides and I trusted Niterider to make a sturdy mount. I'm pretty happy with it and my riding mates assure me it's bright.
These lights are just what I needed to stay visible in my wheelchair. On the road, my profile is pretty small and people do not expect to see me. With these daylight visible NightRider lights there is no problem with being noticed! Daylight or night seriously bright!
The mount is secure and designed for tubing, but it adapted easily to my backpack. I drove on some very bouncy roads with a lot of vibration, and the light stayed secure and operational. USB rechargeable, it is seriously convenient. Be sure to get a back up.
Local shop, great service, Highly recommended!